CA3088453C - Composition and method for stabilizing iron compounds in an aqueous environment, and use of composition - Google Patents
Composition and method for stabilizing iron compounds in an aqueous environment, and use of composition Download PDFInfo
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- CA3088453C CA3088453C CA3088453A CA3088453A CA3088453C CA 3088453 C CA3088453 C CA 3088453C CA 3088453 A CA3088453 A CA 3088453A CA 3088453 A CA3088453 A CA 3088453A CA 3088453 C CA3088453 C CA 3088453C
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- 239000000203 mixture Substances 0.000 title claims abstract description 135
- 230000000087 stabilizing effect Effects 0.000 title claims abstract description 19
- 150000002506 iron compounds Chemical class 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims description 50
- 239000002253 acid Substances 0.000 claims abstract description 48
- 239000000470 constituent Substances 0.000 claims abstract description 33
- 230000007797 corrosion Effects 0.000 claims abstract description 20
- 238000005260 corrosion Methods 0.000 claims abstract description 20
- 239000003112 inhibitor Substances 0.000 claims abstract description 18
- 150000003839 salts Chemical class 0.000 claims abstract description 12
- 239000004480 active ingredient Substances 0.000 claims abstract description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 93
- 229910052742 iron Inorganic materials 0.000 claims description 45
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 34
- -1 methylene phosphonic acid Chemical compound 0.000 claims description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 22
- 239000002270 dispersing agent Substances 0.000 claims description 21
- 229920001174 Diethylhydroxylamine Polymers 0.000 claims description 20
- FVCOIAYSJZGECG-UHFFFAOYSA-N diethylhydroxylamine Chemical compound CCN(O)CC FVCOIAYSJZGECG-UHFFFAOYSA-N 0.000 claims description 20
- 238000005227 gel permeation chromatography Methods 0.000 claims description 18
- 230000008569 process Effects 0.000 claims description 18
- 229920002845 Poly(methacrylic acid) Polymers 0.000 claims description 15
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 10
- PAFZNILMFXTMIY-UHFFFAOYSA-N cyclohexylamine Chemical compound NC1CCCCC1 PAFZNILMFXTMIY-UHFFFAOYSA-N 0.000 claims description 10
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 claims description 10
- 229920000570 polyether Polymers 0.000 claims description 10
- 238000004076 pulp bleaching Methods 0.000 claims description 10
- 239000000797 iron chelating agent Substances 0.000 claims description 7
- 229940075525 iron chelating agent Drugs 0.000 claims description 7
- 230000015572 biosynthetic process Effects 0.000 claims description 6
- FJLUATLTXUNBOT-UHFFFAOYSA-N 1-Hexadecylamine Chemical compound CCCCCCCCCCCCCCCCN FJLUATLTXUNBOT-UHFFFAOYSA-N 0.000 claims description 5
- JAHNSTQSQJOJLO-UHFFFAOYSA-N 2-(3-fluorophenyl)-1h-imidazole Chemical compound FC1=CC=CC(C=2NC=CN=2)=C1 JAHNSTQSQJOJLO-UHFFFAOYSA-N 0.000 claims description 5
- FAXDZWQIWUSWJH-UHFFFAOYSA-N 3-methoxypropan-1-amine Chemical compound COCCCN FAXDZWQIWUSWJH-UHFFFAOYSA-N 0.000 claims description 5
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 claims description 5
- 239000004310 lactic acid Substances 0.000 claims description 5
- 235000014655 lactic acid Nutrition 0.000 claims description 5
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 claims description 5
- 239000011976 maleic acid Substances 0.000 claims description 5
- 229920003145 methacrylic acid copolymer Polymers 0.000 claims description 5
- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 claims description 5
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 claims description 5
- REYJJPSVUYRZGE-UHFFFAOYSA-N Octadecylamine Chemical compound CCCCCCCCCCCCCCCCCCN REYJJPSVUYRZGE-UHFFFAOYSA-N 0.000 claims description 4
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 abstract description 54
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 abstract description 30
- 229920001577 copolymer Polymers 0.000 abstract description 9
- 229920005862 polyol Polymers 0.000 abstract description 9
- 150000003077 polyols Chemical class 0.000 abstract description 9
- UEZVMMHDMIWARA-UHFFFAOYSA-M phosphonate Chemical compound [O-]P(=O)=O UEZVMMHDMIWARA-UHFFFAOYSA-M 0.000 abstract description 8
- ABLZXFCXXLZCGV-UHFFFAOYSA-N phosphonic acid group Chemical group P(O)(O)=O ABLZXFCXXLZCGV-UHFFFAOYSA-N 0.000 abstract description 6
- 125000003277 amino group Chemical group 0.000 abstract description 3
- 239000000243 solution Substances 0.000 description 19
- DUYCTCQXNHFCSJ-UHFFFAOYSA-N dtpmp Chemical compound OP(=O)(O)CN(CP(O)(O)=O)CCN(CP(O)(=O)O)CCN(CP(O)(O)=O)CP(O)(O)=O DUYCTCQXNHFCSJ-UHFFFAOYSA-N 0.000 description 11
- 238000004061 bleaching Methods 0.000 description 8
- 150000002978 peroxides Chemical class 0.000 description 8
- 238000012360 testing method Methods 0.000 description 6
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 5
- 150000002148 esters Chemical class 0.000 description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- 238000000354 decomposition reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000003381 stabilizer Substances 0.000 description 4
- VHSHLMUCYSAUQU-UHFFFAOYSA-N 2-hydroxypropyl methacrylate Chemical compound CC(O)COC(=O)C(C)=C VHSHLMUCYSAUQU-UHFFFAOYSA-N 0.000 description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 3
- 229920001091 Poly(octyl cyanoacrylate) Polymers 0.000 description 3
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 3
- 229920001131 Pulp (paper) Polymers 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 3
- 238000006731 degradation reaction Methods 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- DNORZUSMZSZZKU-UHFFFAOYSA-N ethyl 2-[5-(4-chlorophenyl)pentyl]oxirane-2-carboxylate Chemical compound C=1C=C(Cl)C=CC=1CCCCCC1(C(=O)OCC)CO1 DNORZUSMZSZZKU-UHFFFAOYSA-N 0.000 description 3
- 229910052748 manganese Inorganic materials 0.000 description 3
- 239000011572 manganese Substances 0.000 description 3
- 238000012643 polycondensation polymerization Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000000523 sample Substances 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- VPTUPAVOBUEXMZ-UHFFFAOYSA-N (1-hydroxy-2-phosphonoethyl)phosphonic acid Chemical compound OP(=O)(O)C(O)CP(O)(O)=O VPTUPAVOBUEXMZ-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 2
- YDONNITUKPKTIG-UHFFFAOYSA-N [Nitrilotris(methylene)]trisphosphonic acid Chemical compound OP(O)(=O)CN(CP(O)(O)=O)CP(O)(O)=O YDONNITUKPKTIG-UHFFFAOYSA-N 0.000 description 2
- 239000008346 aqueous phase Substances 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 238000006555 catalytic reaction Methods 0.000 description 2
- 230000009920 chelation Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000009616 inductively coupled plasma Methods 0.000 description 2
- 230000005764 inhibitory process Effects 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000002390 rotary evaporation Methods 0.000 description 2
- 239000002455 scale inhibitor Substances 0.000 description 2
- 159000000000 sodium salts Chemical class 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 241000669072 Chrysomphalus dictyospermi Species 0.000 description 1
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 1
- KIDJHPQACZGFTI-UHFFFAOYSA-N [6-[bis(phosphonomethyl)amino]hexyl-(phosphonomethyl)amino]methylphosphonic acid Chemical compound OP(O)(=O)CN(CP(O)(O)=O)CCCCCCN(CP(O)(O)=O)CP(O)(O)=O KIDJHPQACZGFTI-UHFFFAOYSA-N 0.000 description 1
- YWMWZKYVGNWJPU-UHFFFAOYSA-N [bis[6-[bis(phosphonomethyl)amino]hexyl]amino]methylphosphonic acid Chemical compound OP(=O)(O)CN(CP(O)(O)=O)CCCCCCN(CP(O)(=O)O)CCCCCCN(CP(O)(O)=O)CP(O)(O)=O YWMWZKYVGNWJPU-UHFFFAOYSA-N 0.000 description 1
- 239000012496 blank sample Substances 0.000 description 1
- 239000007844 bleaching agent Substances 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 239000002738 chelating agent Substances 0.000 description 1
- 230000000536 complexating effect Effects 0.000 description 1
- 239000008139 complexing agent Substances 0.000 description 1
- 230000009849 deactivation Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 235000014413 iron hydroxide Nutrition 0.000 description 1
- 235000013980 iron oxide Nutrition 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 229920005646 polycarboxylate Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 238000013112 stability test Methods 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 229920001897 terpolymer Polymers 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
- C01G49/02—Oxides; Hydroxides
- C01G49/04—Ferrous oxide [FeO]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
- C02F5/10—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances
- C02F5/14—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances containing phosphorus
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
- C01G49/14—Sulfates
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/68—Treatment of water, waste water, or sewage by addition of specified substances, e.g. trace elements, for ameliorating potable water
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
- C23F11/10—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using organic inhibitors
- C23F11/14—Nitrogen-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/22—Rheological behaviour as dispersion, e.g. viscosity, sedimentation stability
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
- C02F2101/203—Iron or iron compound
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/26—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof
- C02F2103/28—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof from the paper or cellulose industry
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/08—Corrosion inhibition
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/22—Eliminating or preventing deposits, scale removal, scale prevention
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C211/00—Compounds containing amino groups bound to a carbon skeleton
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F9/00—Compounds containing elements of Groups 5 or 15 of the Periodic Table
- C07F9/02—Phosphorus compounds
- C07F9/28—Phosphorus compounds with one or more P—C bonds
- C07F9/38—Phosphonic acids [RP(=O)(OH)2]; Thiophosphonic acids ; [RP(=X1)(X2H)2(X1, X2 are each independently O, S or Se)]
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F20/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride, ester, amide, imide or nitrile thereof
- C08F20/02—Monocarboxylic acids having less than ten carbon atoms, Derivatives thereof
- C08F20/04—Acids, Metal salts or ammonium salts thereof
- C08F20/06—Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/04—Acids; Metal salts or ammonium salts thereof
- C08F220/06—Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
- Detergent Compositions (AREA)
- Paper (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)
Abstract
Composition for stabilizing iron compounds in an aqueous environment, which comprises a polycarboxylic acid or its salt (s), at least one monomeric or polymeric phosphonate comprising at least one phosphonic acid group, or its salt (s), at least one corrosion inhibitor comprising amino groups, and 1 -15 weight-%of polycitric acid or a copolymer of citric acid with polyols or glycerol, calculated as active ingredient from the total weight of the constituents in the composition, as dry.
Description
2 COMPOSITION AND METHOD FOR STABILIZING IRON COMPOUNDS IN
AN AQUEOUS ENVIRONMENT, AND USE OF COMPOSITION
TECHNICAL FIELD
The invention relates to a composition and a method for stabilizing iron compounds in an aqueous environment. The invention also relates to the use of said composition as iron dispersant or iron chelating agent.
BACKGROUND ART
Iron is always existing in water and it could form deposit in the equipment and pipeline. The deposited iron may result in corrosion of metal pipes or equipment. Therefore, deposition of iron is a problem especially in water treatment industry. Dispersant for iron, which may disperse iron compound, is typically employed in water treatment industry. The most suitable dispersants can be chosen on the grounds of the requirements. Different dispersants have effect on different chemicals, such as iron, manganese, calcium carbonate or calcium sulfate. For water treatment industry, diethylenetriamine penta(methylene phosphonic acid) (DTPMPA) is one of typically used dispersants. However, a high phosphorus content of DTPMPA may have negative impact on environment.
In pulp and paper manufacturing, iron coming from wood and from the process equipment is a problem in pulp bleaching. Hydrogen peroxide is widely used as a bleaching agent for different mechanical and chemi-mechanical pulps. Using hydrogen peroxide it is possible to improve pulp brightness. Iron and manganese are the main catalysts for the decomposition of hydrogen peroxide. The decomposition of hydrogen peroxide results in deterioration of fibers, lower whiteness and brightness, and increased consumption of hydrogen peroxide. To reach the required ISO brightness, higher peroxide consumption is needed when iron exists in bleaching process. Therefore, specific chelating steps are included into the chemical pulp process, usually prior to bleaching stages, for eliminating effects of iron and manganese. To detect the efficiency of the deactivation of the metals, usually the pulp properties such as brightness result and viscosity are measured. Also, the residual hydrogen peroxide after bleaching is informative.
Phosphonates are typically used as efficient chelating agents in those steps.
However, the effectiveness of phosphonates might be insufficient, and the hydrogen peroxide consumption cannot be reduced remarkably. In the case of mechanical pulp, iron and manganese may be deactivated by complexing them with monomeric or polymeric complexing agents. This is done to prevent these metal ions from catalyzing the decomposition of hydrogen peroxide. Commonly, DTPMPA is also used as iron chelating agent in pulp and paper industry.
However, there is a constant need for cost effective and environmentally benign compositions for stabilizing iron compounds in water treatment and/or in pulp bleaching processes.
SUMMARY OF INVENTION
An object of this invention is to minimise or even totally eliminate the disadvantages existing in the prior art.
An object of the invention is to provide a stable composition for stabilizing iron compounds in an aqueous environment. Especially, an object of the invention is to provide a composition suitable for use as iron dispersant in water treatment for controlling, preventing and/or reducing the formation of iron deposit.
Further, it is an object of the present invention to provide a composition suitable for use as iron chelating agent in pulp bleaching for stabilizing hydrogen peroxide and so providing a cost-effective method for preventing hydrogen peroxide degradation due to iron catalysis in bleaching processes.
In order to achieve among others the objects presented above, the invention is characterized by what is presented in the characterizing parts of the enclosed independent claims.
Some preferred embodiments of the invention will be described in the other dependent claims.
The embodiments and advantages mentioned in this text relate, where
AN AQUEOUS ENVIRONMENT, AND USE OF COMPOSITION
TECHNICAL FIELD
The invention relates to a composition and a method for stabilizing iron compounds in an aqueous environment. The invention also relates to the use of said composition as iron dispersant or iron chelating agent.
BACKGROUND ART
Iron is always existing in water and it could form deposit in the equipment and pipeline. The deposited iron may result in corrosion of metal pipes or equipment. Therefore, deposition of iron is a problem especially in water treatment industry. Dispersant for iron, which may disperse iron compound, is typically employed in water treatment industry. The most suitable dispersants can be chosen on the grounds of the requirements. Different dispersants have effect on different chemicals, such as iron, manganese, calcium carbonate or calcium sulfate. For water treatment industry, diethylenetriamine penta(methylene phosphonic acid) (DTPMPA) is one of typically used dispersants. However, a high phosphorus content of DTPMPA may have negative impact on environment.
In pulp and paper manufacturing, iron coming from wood and from the process equipment is a problem in pulp bleaching. Hydrogen peroxide is widely used as a bleaching agent for different mechanical and chemi-mechanical pulps. Using hydrogen peroxide it is possible to improve pulp brightness. Iron and manganese are the main catalysts for the decomposition of hydrogen peroxide. The decomposition of hydrogen peroxide results in deterioration of fibers, lower whiteness and brightness, and increased consumption of hydrogen peroxide. To reach the required ISO brightness, higher peroxide consumption is needed when iron exists in bleaching process. Therefore, specific chelating steps are included into the chemical pulp process, usually prior to bleaching stages, for eliminating effects of iron and manganese. To detect the efficiency of the deactivation of the metals, usually the pulp properties such as brightness result and viscosity are measured. Also, the residual hydrogen peroxide after bleaching is informative.
Phosphonates are typically used as efficient chelating agents in those steps.
However, the effectiveness of phosphonates might be insufficient, and the hydrogen peroxide consumption cannot be reduced remarkably. In the case of mechanical pulp, iron and manganese may be deactivated by complexing them with monomeric or polymeric complexing agents. This is done to prevent these metal ions from catalyzing the decomposition of hydrogen peroxide. Commonly, DTPMPA is also used as iron chelating agent in pulp and paper industry.
However, there is a constant need for cost effective and environmentally benign compositions for stabilizing iron compounds in water treatment and/or in pulp bleaching processes.
SUMMARY OF INVENTION
An object of this invention is to minimise or even totally eliminate the disadvantages existing in the prior art.
An object of the invention is to provide a stable composition for stabilizing iron compounds in an aqueous environment. Especially, an object of the invention is to provide a composition suitable for use as iron dispersant in water treatment for controlling, preventing and/or reducing the formation of iron deposit.
Further, it is an object of the present invention to provide a composition suitable for use as iron chelating agent in pulp bleaching for stabilizing hydrogen peroxide and so providing a cost-effective method for preventing hydrogen peroxide degradation due to iron catalysis in bleaching processes.
In order to achieve among others the objects presented above, the invention is characterized by what is presented in the characterizing parts of the enclosed independent claims.
Some preferred embodiments of the invention will be described in the other dependent claims.
The embodiments and advantages mentioned in this text relate, where
3 applicable, both to the composition, the method as well as to the uses according to the invention, even though it is not always specifically mentioned.
A typical composition according to the invention for stabilizing iron compounds in an aqueous environment comprises - a polycarboxylic acid or its salt(s), - at least one monomeric or polymeric phosphonate comprising at least one phosphonic acid group, or its salt(s), - at least one corrosion inhibitor comprising amino groups, and - 1 ¨ 15 weight-% of polycitric acid or a copolymer of citric acid with polyols or glycerol, calculated as active ingredient from the total weight of the constituents in the composition, as dry.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 shows the results obtained in Example 1 of the present application.
DETAILED DESCRIPTION OF THE INVENTION
According to the present invention, the composition for stabilizing iron compounds in an aqueous environment is typically used for controlling and preventing the formation of iron deposit and/or dissolving iron deposits in an aqueous system, especially in water treatment processes. Further, the composition according to the present invention is also used for stabilizing hydrogen peroxide in pulp bleaching process, since adding the composition according to the present invention in oxidation could efficiently prevent hydrogen peroxide degradation due to iron catalysis. Therefore, iron chelation by using the composition according to the present invention in pulp bleaching may decrease H202 consumption.
Typical method according to the present invention for stabilizing iron compound in an aqueous system comprises adding the composition according to the present invention to an aqueous system.
Now, it has been surprisingly found that polycitric acid or a copolymer of citric acid with polyols or glycerol in combination with monomeric or polymeric
A typical composition according to the invention for stabilizing iron compounds in an aqueous environment comprises - a polycarboxylic acid or its salt(s), - at least one monomeric or polymeric phosphonate comprising at least one phosphonic acid group, or its salt(s), - at least one corrosion inhibitor comprising amino groups, and - 1 ¨ 15 weight-% of polycitric acid or a copolymer of citric acid with polyols or glycerol, calculated as active ingredient from the total weight of the constituents in the composition, as dry.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 shows the results obtained in Example 1 of the present application.
DETAILED DESCRIPTION OF THE INVENTION
According to the present invention, the composition for stabilizing iron compounds in an aqueous environment is typically used for controlling and preventing the formation of iron deposit and/or dissolving iron deposits in an aqueous system, especially in water treatment processes. Further, the composition according to the present invention is also used for stabilizing hydrogen peroxide in pulp bleaching process, since adding the composition according to the present invention in oxidation could efficiently prevent hydrogen peroxide degradation due to iron catalysis. Therefore, iron chelation by using the composition according to the present invention in pulp bleaching may decrease H202 consumption.
Typical method according to the present invention for stabilizing iron compound in an aqueous system comprises adding the composition according to the present invention to an aqueous system.
Now, it has been surprisingly found that polycitric acid or a copolymer of citric acid with polyols or glycerol in combination with monomeric or polymeric
4 phosphonate, such as PAPEMP, provides synergetic effect and so the composition according to the present invention is able to provide several advantages simultaneously compared to the commonly used DTPMPA, such as high temperature tolerance and high efficiency even at low dosage amounts of the composition. Thus, the composition according to the present invention provides cost effective iron dispersant composition with high efficiency for use as water treatment systems or iron chelating agent composition for use in pulp bleaching processes. The composition according to the present invention has also remarkably less phosphorus content than the commonly used DTPMPA, and so the present invention also reduces negative impact on environment.
Iron dispersant composition refers in this description to a composition to prevent or reducing fouling of iron oxides/hydroxides in process equipment in water treatment processes. The mechanism of the iron dispersant may be based on dispersing of the iron deposits, or preventing iron compounds to settle, precipitate or agglomerate. Iron dispersant according to the present invention is not only effective for iron, but also have efficiency in calcium carbonate deposit control. Therefore, especially in water treatment industry, it provides multi-function on deposit control.
In paper and pulp industry, peroxide consumption speed in bleaching may be decreased greatly by using the composition according to the present invention as iron chelating agent. Wien adding composition according to the present invention in oxidation, it could efficiently stabilize hydrogen peroxide and prevent hydrogen peroxide degradation due to iron catalyzing.
The composition according to the invention comprises at least one monomeric or polymeric phosphonate comprising at least one phosphonic acid group. The phosphonate may also comprise any suitable salt(s) thereof.
The phosphonate may be selected from hydroxyethylene diphosphonic acid (HEDP), amino tris(methylenephosphonic acid) (ATMP), 2-phosphonobutane-1,2,4,-tricarboxylic acid (PBTC), diethylenetriamine penta(methylene phosphonic acid) (DTPMPA), hexamethylenediamine tetramethylene phosphonic acid (BHMTPMPA). polyamino polyether methylene phosphonic acid (PAPEMP) or any combination of them.
According to one preferable embodiment, the phosphonate is polyamino polyether methylene phosphonic acid (PAPEMP) due to its good chelation characteristics. The total amount of the monomeric or polymeric phosphonate(s), such as PAPEMP, may be in the range of 10 - 90 weight-%, preferably 60 ¨ 90 weight-%, and more preferably 70 - 80 weight-%,
Iron dispersant composition refers in this description to a composition to prevent or reducing fouling of iron oxides/hydroxides in process equipment in water treatment processes. The mechanism of the iron dispersant may be based on dispersing of the iron deposits, or preventing iron compounds to settle, precipitate or agglomerate. Iron dispersant according to the present invention is not only effective for iron, but also have efficiency in calcium carbonate deposit control. Therefore, especially in water treatment industry, it provides multi-function on deposit control.
In paper and pulp industry, peroxide consumption speed in bleaching may be decreased greatly by using the composition according to the present invention as iron chelating agent. Wien adding composition according to the present invention in oxidation, it could efficiently stabilize hydrogen peroxide and prevent hydrogen peroxide degradation due to iron catalyzing.
The composition according to the invention comprises at least one monomeric or polymeric phosphonate comprising at least one phosphonic acid group. The phosphonate may also comprise any suitable salt(s) thereof.
The phosphonate may be selected from hydroxyethylene diphosphonic acid (HEDP), amino tris(methylenephosphonic acid) (ATMP), 2-phosphonobutane-1,2,4,-tricarboxylic acid (PBTC), diethylenetriamine penta(methylene phosphonic acid) (DTPMPA), hexamethylenediamine tetramethylene phosphonic acid (BHMTPMPA). polyamino polyether methylene phosphonic acid (PAPEMP) or any combination of them.
According to one preferable embodiment, the phosphonate is polyamino polyether methylene phosphonic acid (PAPEMP) due to its good chelation characteristics. The total amount of the monomeric or polymeric phosphonate(s), such as PAPEMP, may be in the range of 10 - 90 weight-%, preferably 60 ¨ 90 weight-%, and more preferably 70 - 80 weight-%,
5 calculated from the total weight of the constituents in the composition, as dry.
The composition of the invention further comprises a polycarboxylic acid or its salt(s) for providing high temperature tolerant performance and good dispersant performance. According to one embodiment of the invention, the polycarboxylic acid is selected from poly(meth)acrylic acid, or a copolymer of (meth)acrylic acid and maleic acid, itaconic acid or lactic acid. According to one preferred embodiment of the invention, the polycarboxylic acid is poly(meth)acrylic acid. The polycarboxylic acid may have a weight average molecular weight MW less than 5000 g/mol, preferably in a range of 1000 ¨
5000 g/mol. The molecular weights are determined by using gel permeation chromatography (GPC). According to one embodiment of the invention, the amount of the polycarboxylic acid is in the range of 5 ¨ 80 weight-%, preferably 20 ¨ 50 weight-% and more preferably 20 ¨ 30 weight-%, calculated from the total weight of the constituents in the composition, as dry.
Further, the composition according to the present invention comprises at least one corrosion inhibitor comprising amino groups. The amount of the corrosion inhibitor may be in the range of 2 ¨ 10 weight-%, calculated from the total weight of the active constituents in the composition, as dry.
According to an embodiment of the invention the corrosion, the inhibitor is selected from diethyl hydroxylam ine (DEHA), octadecylam in e, hexadecylamine, cyclohexylamine, methoxypropylamine, other fatty alcohol amines, or any combination of them. According to one preferred embodiment, the corrosion inhibitor is diethyl hydroxylamine (DEHA) due to its excellent iron corrosion inhibition performance and efficiency even at small dosage amount.
The composition according to the present invention comprises also polycitric acid or a copolymer of citric acid with polyols or glycerol. According to a preferred embodiment of the invention, the composition comprises polycitric acid, which is obtained by polymerization using citric acid as raw material.
Therefore, the composition according to the invention includes two kinds of
The composition of the invention further comprises a polycarboxylic acid or its salt(s) for providing high temperature tolerant performance and good dispersant performance. According to one embodiment of the invention, the polycarboxylic acid is selected from poly(meth)acrylic acid, or a copolymer of (meth)acrylic acid and maleic acid, itaconic acid or lactic acid. According to one preferred embodiment of the invention, the polycarboxylic acid is poly(meth)acrylic acid. The polycarboxylic acid may have a weight average molecular weight MW less than 5000 g/mol, preferably in a range of 1000 ¨
5000 g/mol. The molecular weights are determined by using gel permeation chromatography (GPC). According to one embodiment of the invention, the amount of the polycarboxylic acid is in the range of 5 ¨ 80 weight-%, preferably 20 ¨ 50 weight-% and more preferably 20 ¨ 30 weight-%, calculated from the total weight of the constituents in the composition, as dry.
Further, the composition according to the present invention comprises at least one corrosion inhibitor comprising amino groups. The amount of the corrosion inhibitor may be in the range of 2 ¨ 10 weight-%, calculated from the total weight of the active constituents in the composition, as dry.
According to an embodiment of the invention the corrosion, the inhibitor is selected from diethyl hydroxylam ine (DEHA), octadecylam in e, hexadecylamine, cyclohexylamine, methoxypropylamine, other fatty alcohol amines, or any combination of them. According to one preferred embodiment, the corrosion inhibitor is diethyl hydroxylamine (DEHA) due to its excellent iron corrosion inhibition performance and efficiency even at small dosage amount.
The composition according to the present invention comprises also polycitric acid or a copolymer of citric acid with polyols or glycerol. According to a preferred embodiment of the invention, the composition comprises polycitric acid, which is obtained by polymerization using citric acid as raw material.
Therefore, the composition according to the invention includes two kinds of
6 carboxylic acid, i.e. polycitric acid and polycarboxylic acid or its salt(s) as defined above. The amount of polycitric acid or a copolymer of citric acid with polyols or glycerol may be in the range of 1 - 15 weight-%, calculated as active ingredient from the total weight of the constituents in the composition, as dry. According to one preferred embodiment of the invention, the amount of polycitric acid or a copolymer of citric acid with polyols or glycerol is less than 15 weight-%, calculated as active ingredient from the total weight of the constituents in the composition, as dry. In some preferred embodiments, the amount of polycitric acid or a copolymer of citric acid with polyols or glycerol is in the range of 5 - 10 weight-%, calculated as active ingredient from the total weight of the constituents in the composition, as dry, when optimising the effect and total costs of the composition. Preferably, the composition according to the present invention comprises polycitric acid in an amount of 1 ¨ 15 weight-% or 5 ¨ 10 weight-%, calculated from the total weight of the constituents in the composition, as dry, and this amount is not included to the amount of the polycarboxylic acid or its salt(s) defined separately in the present application.
According to an embodiment of the invention, a copolymer of citric acid with polyols or glycerol may be poly(citric acid-glycol) ester, poly(citric acid-ethylene glycol) ester, poly(citric acid-propylene glycol) ester, poly(citric acid-glycerol) ester or poly(citric acid-triethanolamine) ester prepared by subjecting a raw material selected from the group consisting of a mixture of citric acid and glycol, a mixture of citric acid and ethylene glycol, a mixture of citric acid and propylene glycol, a mixture of citric acid and glycerol and a mixture of citric acid and triethanolamine to condensation polymerization. The synthetization of polycitric acid or a copolymer of citric acid with polyols or glycerol applicable to be used in the composition of the present invention is described e.g. in the patent publication CN104030461.
As also disclosed in CN104030461, polycitric acid may be synthesized by condensation polymerization by using citric acid as raw material.
Tetrahydrofuran is used as a solvent, wherein the solvent and citric acid are added in a reactor and the solution is obtained by mixing. Concentrated sulfuric acid is used as a catalyst and added to the solution of the solvent and citric acid and heated to the reflux state to perform condensation polymerization for 4 - 24 h to obtain the reaction solution. The reaction
According to an embodiment of the invention, a copolymer of citric acid with polyols or glycerol may be poly(citric acid-glycol) ester, poly(citric acid-ethylene glycol) ester, poly(citric acid-propylene glycol) ester, poly(citric acid-glycerol) ester or poly(citric acid-triethanolamine) ester prepared by subjecting a raw material selected from the group consisting of a mixture of citric acid and glycol, a mixture of citric acid and ethylene glycol, a mixture of citric acid and propylene glycol, a mixture of citric acid and glycerol and a mixture of citric acid and triethanolamine to condensation polymerization. The synthetization of polycitric acid or a copolymer of citric acid with polyols or glycerol applicable to be used in the composition of the present invention is described e.g. in the patent publication CN104030461.
As also disclosed in CN104030461, polycitric acid may be synthesized by condensation polymerization by using citric acid as raw material.
Tetrahydrofuran is used as a solvent, wherein the solvent and citric acid are added in a reactor and the solution is obtained by mixing. Concentrated sulfuric acid is used as a catalyst and added to the solution of the solvent and citric acid and heated to the reflux state to perform condensation polymerization for 4 - 24 h to obtain the reaction solution. The reaction
7 solution is further neutralized, transferred to extraction and rotary evaporation steps. Organic solvent is removed by rotary evaporation and the obtained polycitric acid is dark brown slime having substantially 100 % content of polycitric acid.
According to one preferred embodiment, the composition comprises 5 - 80 weight-% of poly(meth)acrylic acid, 10 ¨ 90 weight-% of PAPEMP, 2 - 10 weight-% of DEHA, and 1 ¨ 15 weight-% of polycitric acid, calculated from the total weight of the constituents in the composition, as dry. More preferably, the composition comprises 60¨ 90 weight- i or 70 ¨ 80 weight-%
of PAPEMP in combination with poly(meth)acrylic acid, DEHA and polycitric acid. In one preferred embodiment, the composition comprises 60 ¨ 90 weight-% or 70 ¨ 80 weight-% of PAPEMP, 20 ¨ 50 weight-% or 20 ¨ 30 weight-%of poly(meth)acrylic acid, 2 - 10 weight-% of DEHA and 1 ¨ 15 weight-% of polycitric acid, calculated from the total weight of the constituents in the composition, as dry.
The composition according to the invention tolerates high temperatures, i.e.
it is effective also in high temperatures, and so it may be added to the industrial aqueous systems having temperature of the aqueous phase higher than 100 C. The temperature of the aqueous phase in the aqueous system, where the composition is dosed, may be over 100 C, or over 120 C, or even over 200 C.
According to the invention, the composition is added to an aqueous system.
The composition according to the invention may be used in desired dose, depending on the nature of the iron compounds to be stabilized and/or other conditions in the aqueous system where it is used. For example, according to one embodiment of the invention the composition may be added in an amount of 5 ¨ 100 ppm, preferably 5 ¨ 70 ppm, and more preferably 5 ¨ 50 ppm to an aqueous system.
The composition according to the present invention may be used at any process stage of suitable application, where there is a risk for iron deposit formation. According to one embodiment of the invention, the composition according to the present invention may be used for reducing or eliminating the formation of iron deposit in the water treatment systems.
According to one preferred embodiment, the composition comprises 5 - 80 weight-% of poly(meth)acrylic acid, 10 ¨ 90 weight-% of PAPEMP, 2 - 10 weight-% of DEHA, and 1 ¨ 15 weight-% of polycitric acid, calculated from the total weight of the constituents in the composition, as dry. More preferably, the composition comprises 60¨ 90 weight- i or 70 ¨ 80 weight-%
of PAPEMP in combination with poly(meth)acrylic acid, DEHA and polycitric acid. In one preferred embodiment, the composition comprises 60 ¨ 90 weight-% or 70 ¨ 80 weight-% of PAPEMP, 20 ¨ 50 weight-% or 20 ¨ 30 weight-%of poly(meth)acrylic acid, 2 - 10 weight-% of DEHA and 1 ¨ 15 weight-% of polycitric acid, calculated from the total weight of the constituents in the composition, as dry.
The composition according to the invention tolerates high temperatures, i.e.
it is effective also in high temperatures, and so it may be added to the industrial aqueous systems having temperature of the aqueous phase higher than 100 C. The temperature of the aqueous phase in the aqueous system, where the composition is dosed, may be over 100 C, or over 120 C, or even over 200 C.
According to the invention, the composition is added to an aqueous system.
The composition according to the invention may be used in desired dose, depending on the nature of the iron compounds to be stabilized and/or other conditions in the aqueous system where it is used. For example, according to one embodiment of the invention the composition may be added in an amount of 5 ¨ 100 ppm, preferably 5 ¨ 70 ppm, and more preferably 5 ¨ 50 ppm to an aqueous system.
The composition according to the present invention may be used at any process stage of suitable application, where there is a risk for iron deposit formation. According to one embodiment of the invention, the composition according to the present invention may be used for reducing or eliminating the formation of iron deposit in the water treatment systems.
8 The composition according to the present invention may be used at bleaching process for stabilizing hydrogen peroxide. It may be added to the pulp prior to bleaching stages.
EXPERIMENTAL
Example 1: Iron dispersion performance evaluation in water Solution A: cationic CaC12 liquid, Ca2+ concentration is 300 ppm;
Solution B: Selected scale inhibitor is diluted according to a certain concentration;
Solution C: 5 g (FeSO4.7H20)/I, fresh;
Solution D: 500 ppm Na2B402 liquid.
Blank test: 50 ml solution A+ 12 ml deionized water +1 ml solution C + 37 ml solution D.
Scale inhibition test sample: 50 ml solution A + 12 ml deionized water +
selected solution B + 1 ml solution C + 37 ml solution D, pH about 8.7.
After all the chemicals of each sample are added into the bottle, the bottles are stirred for 15 min. Then, the bottles are put into the water bath and heated for 20 h. The bottles are taken out from the water bath and stood for 1 hour. The solution from each bottle is filtered and Ca2+ concentration in the filtrates are determined using inductively coupled plasma (1CP) instrument.
Fe content is analyzed from the supernatant by using ICP.
Iron dispersant capability calculation (%):
X2¨X1 n(iron dispersant) - 10-X1 wherein X1 is Iron concentration (mg/I) in blank sample before treatment, X2 is Iron concentration (mg/I) after treatment, 10 is Iron preliminary concentration (mg/I).
EXPERIMENTAL
Example 1: Iron dispersion performance evaluation in water Solution A: cationic CaC12 liquid, Ca2+ concentration is 300 ppm;
Solution B: Selected scale inhibitor is diluted according to a certain concentration;
Solution C: 5 g (FeSO4.7H20)/I, fresh;
Solution D: 500 ppm Na2B402 liquid.
Blank test: 50 ml solution A+ 12 ml deionized water +1 ml solution C + 37 ml solution D.
Scale inhibition test sample: 50 ml solution A + 12 ml deionized water +
selected solution B + 1 ml solution C + 37 ml solution D, pH about 8.7.
After all the chemicals of each sample are added into the bottle, the bottles are stirred for 15 min. Then, the bottles are put into the water bath and heated for 20 h. The bottles are taken out from the water bath and stood for 1 hour. The solution from each bottle is filtered and Ca2+ concentration in the filtrates are determined using inductively coupled plasma (1CP) instrument.
Fe content is analyzed from the supernatant by using ICP.
Iron dispersant capability calculation (%):
X2¨X1 n(iron dispersant) - 10-X1 wherein X1 is Iron concentration (mg/I) in blank sample before treatment, X2 is Iron concentration (mg/I) after treatment, 10 is Iron preliminary concentration (mg/I).
9 The performance evaluation is carried out by using the following scale inhibitors: the composition according to the present invention (ND), commercial iron dispersant products Kemguard 5876 (Acrylic acid terpolymer, sodium salt) and Kemguard 5042 (Polycarboxylate, sodium salt) from Kemira, PBTC, BHMPTMPA, HPMA, POCA and DTPMPA as solution B. The ND
composition according to the present invention comprises 5 - 80 weight-% of poly(meth)acrylic acid, 10 - 90 weight-% of PAPEMP, 2 - 10 weight-% of DEHA and 1 - 15 weight-% of polycitric acid, calculated from the total weight of the constituents in the composition, as dry.
The performance of the dispersant compositions is tested at two different temperatures 50 CC and 90 C. Also, two different concentrations, namely 10 ppm and 20 ppm, are tested. The results are shown in Table 1 and Table 2.
Table 1. The results of Iron dispersion performance at 50 C
Iron dispersant capability calculation (%) Dispersant 10 ppm 20 ppm Blank test 1.12 1.12 Kemguard 5876 2.10 3.16 Kemguard 5042 3.40 3.45 PBTC 4.86 3.60 BHMPTMPA 2.82 2.96 HPMA 2.52 3.42 POCA 3.25 3.21 DTPMPA 7.88 13.21 ND 13.59 69.40 Table 2. The results of Iron dispersion performance at 90 C
Iron dispersant capability calculation (%) Dispersant 10 ppm 20 ppm Blank test 0.28 0.28 Kemguard 5876 0.66 0.45 Kemguard 5042 0.61 0.63 PBTC 0.79 4.04 BHMPTMPA 1.04 1.89 HPMA 1.05 1.57
composition according to the present invention comprises 5 - 80 weight-% of poly(meth)acrylic acid, 10 - 90 weight-% of PAPEMP, 2 - 10 weight-% of DEHA and 1 - 15 weight-% of polycitric acid, calculated from the total weight of the constituents in the composition, as dry.
The performance of the dispersant compositions is tested at two different temperatures 50 CC and 90 C. Also, two different concentrations, namely 10 ppm and 20 ppm, are tested. The results are shown in Table 1 and Table 2.
Table 1. The results of Iron dispersion performance at 50 C
Iron dispersant capability calculation (%) Dispersant 10 ppm 20 ppm Blank test 1.12 1.12 Kemguard 5876 2.10 3.16 Kemguard 5042 3.40 3.45 PBTC 4.86 3.60 BHMPTMPA 2.82 2.96 HPMA 2.52 3.42 POCA 3.25 3.21 DTPMPA 7.88 13.21 ND 13.59 69.40 Table 2. The results of Iron dispersion performance at 90 C
Iron dispersant capability calculation (%) Dispersant 10 ppm 20 ppm Blank test 0.28 0.28 Kemguard 5876 0.66 0.45 Kemguard 5042 0.61 0.63 PBTC 0.79 4.04 BHMPTMPA 1.04 1.89 HPMA 1.05 1.57
10 POCA 0.77 0.95 DTPMPA 23.25 31.51 ND 78.86 82.76 From the experiment results can be seen that, the ND material efficiency is much better than other compositions.
Example 2: The effect of stabilizer on alkaline H202 bleaching The peroxide stability test is used to determine the peroxide content in a water solution containing specific amount of Fe ions and monitor the peroxide decomposition rate. The test is performed in Erlenmeyer flasks. The dilution water is heated to 90 C before adding 11 ppm Fe ions and the 100 ppm stabilizer composition to be tested. The pH is adjusted with NaOH to pH 10 before adding peroxide (initial peroxide content 3 g/1). The residual peroxide (g/I) in the sample is titrated after 5, 10, 15, 30, 60 and 90 min.
The following stabilizers are used in the tests: the composition according to the present invention (ND), commercial stabilizer products Fennobrite FB590 from Kemira and CF2025 from Kemira, which comprise phosphonates. The ND composition according to the present invention comprises 5 - 80 weight-%
of poly(meth)acrylic acid, 10 ¨ 90 weight-% of PAPEMP, 2 - 10 weight-% of DEHA and 1 ¨ 15 weight-% of polycitric acid, calculated from the total weight of the constituents in the composition, as dry.
The results are shown in Figure 1. Compared with FB 590 and CF 2025, the ND composition according to the present invention has better performance in H202 stabilizing.
Even if the invention was described with reference to what at present seems to be the most practical and preferred embodiments, it is appreciated that the invention shall not be limited to the embodiments described above, but the invention is intended to cover also different modifications and equivalent technical solutions.
***
In some aspects, the present invention relates to one or more of the following items.
Item 1. A method for stabilizing iron compounds in an aqueous environment, Date Recue/Date Received 2022-10-27
Example 2: The effect of stabilizer on alkaline H202 bleaching The peroxide stability test is used to determine the peroxide content in a water solution containing specific amount of Fe ions and monitor the peroxide decomposition rate. The test is performed in Erlenmeyer flasks. The dilution water is heated to 90 C before adding 11 ppm Fe ions and the 100 ppm stabilizer composition to be tested. The pH is adjusted with NaOH to pH 10 before adding peroxide (initial peroxide content 3 g/1). The residual peroxide (g/I) in the sample is titrated after 5, 10, 15, 30, 60 and 90 min.
The following stabilizers are used in the tests: the composition according to the present invention (ND), commercial stabilizer products Fennobrite FB590 from Kemira and CF2025 from Kemira, which comprise phosphonates. The ND composition according to the present invention comprises 5 - 80 weight-%
of poly(meth)acrylic acid, 10 ¨ 90 weight-% of PAPEMP, 2 - 10 weight-% of DEHA and 1 ¨ 15 weight-% of polycitric acid, calculated from the total weight of the constituents in the composition, as dry.
The results are shown in Figure 1. Compared with FB 590 and CF 2025, the ND composition according to the present invention has better performance in H202 stabilizing.
Even if the invention was described with reference to what at present seems to be the most practical and preferred embodiments, it is appreciated that the invention shall not be limited to the embodiments described above, but the invention is intended to cover also different modifications and equivalent technical solutions.
***
In some aspects, the present invention relates to one or more of the following items.
Item 1. A method for stabilizing iron compounds in an aqueous environment, Date Recue/Date Received 2022-10-27
11 characterized in that the method comprises adding to an aqueous system a composition, which comprises - a polycarboxylic acid or its salt(s) selected from the group consisting of poly(meth)acrylic acid and a copolymer of (meth)acrylic acid and maleic acid, itaconic acid or lactic acid, - 60 ¨ 90 weight-% of polyamino polyether methylene phosphonic acid (PAPEMP), calculated from the total weight of the constituents in the composition as dry, - a corrosion inhibitor selected from the group consisting of diethyl hydroxylamine (DEHA), octadecylamine, hexadecylamine, cyclohexylamine, methoxypropylamine, other fatty alcohol amines and any combination of them, and - 1 ¨ 15 weight-% of polycitric acid, calculated as active ingredient from the total weight of the constituents in the composition as dry.
Item 2. The method according to item 1, characterized in that the composition comprises poly(meth)acrylic acid.
Item 3. The method according to item 1 or 2, characterized in that the polycarboxylic acid has a weight average molecular weight MW less than 5000 g/mol, determined by using gel permeation chromatography (GPC).
Item 4. The method according to item 1 or 2, characterized in that the polycarboxylic acid has a weight average molecular weight MW in the range of 1000 ¨ 5000 g/mol, determined by using gel permeation chromatography (GPC).
Item 5. The method according to any one of items 1 to 4, characterized in that the composition comprises diethyl hydroxylamine (DENA) as the corrosion inhibitor.
Item 6. The method according to any one of items 1 to 5, characterized in that Date Recue/Date Received 2022-10-27
Item 2. The method according to item 1, characterized in that the composition comprises poly(meth)acrylic acid.
Item 3. The method according to item 1 or 2, characterized in that the polycarboxylic acid has a weight average molecular weight MW less than 5000 g/mol, determined by using gel permeation chromatography (GPC).
Item 4. The method according to item 1 or 2, characterized in that the polycarboxylic acid has a weight average molecular weight MW in the range of 1000 ¨ 5000 g/mol, determined by using gel permeation chromatography (GPC).
Item 5. The method according to any one of items 1 to 4, characterized in that the composition comprises diethyl hydroxylamine (DENA) as the corrosion inhibitor.
Item 6. The method according to any one of items 1 to 5, characterized in that Date Recue/Date Received 2022-10-27
12 the amount of the polycarboxylic acid in the composition is in the range of 5 ¨
30 weight-%, calculated from the total weight of the constituents in the composition, as dry.
Item 7. The method according to any one of items 1 to 6, characterized in that the amount of polyamino polyether methylene phosphonic acid (PAPEMP) in the composition is in the range of 70 ¨ 80 weight-%, calculated from the total weight of the constituents in the composition, as dry.
Item 8. The method according to any one of items Ito 7, characterized in that the amount of the corrosion inhibitor in the composition is in the range of 2 ¨ 10 weight -%, calculated from the total weight of the constituents in the composition, as dry.
Item 9. The method according to any one of items Ito 8, characterized in that the composition is added to the aqueous system in an amount of 5¨ 100 ppm.
Item 10. The method according to any one of items Ito 8, characterized in that the composition is added to the aqueous system in an amount of 5¨ 70 ppm.
Item 11. The method according to any one of items 1 to 8, characterized in that the composition is added to the aqueous system in an amount of 5¨ 50 ppm.
Item 12. The method according to any one of items 1 to 11, characterized in that the aqueous system is a water treatment system or a pulp bleaching process.
Item 13. Use of a composition for stabilizing iron compounds in an aqueous system, wherein the composition comprises - a polycarboxylic acid or its salt(s) selected from the group consisting of poly(meth)acrylic acid and a copolymer of (meth)acrylic acid and maleic acid, itaconic acid or lactic acid, Date Recue/Date Received 2022-10-27
30 weight-%, calculated from the total weight of the constituents in the composition, as dry.
Item 7. The method according to any one of items 1 to 6, characterized in that the amount of polyamino polyether methylene phosphonic acid (PAPEMP) in the composition is in the range of 70 ¨ 80 weight-%, calculated from the total weight of the constituents in the composition, as dry.
Item 8. The method according to any one of items Ito 7, characterized in that the amount of the corrosion inhibitor in the composition is in the range of 2 ¨ 10 weight -%, calculated from the total weight of the constituents in the composition, as dry.
Item 9. The method according to any one of items Ito 8, characterized in that the composition is added to the aqueous system in an amount of 5¨ 100 ppm.
Item 10. The method according to any one of items Ito 8, characterized in that the composition is added to the aqueous system in an amount of 5¨ 70 ppm.
Item 11. The method according to any one of items 1 to 8, characterized in that the composition is added to the aqueous system in an amount of 5¨ 50 ppm.
Item 12. The method according to any one of items 1 to 11, characterized in that the aqueous system is a water treatment system or a pulp bleaching process.
Item 13. Use of a composition for stabilizing iron compounds in an aqueous system, wherein the composition comprises - a polycarboxylic acid or its salt(s) selected from the group consisting of poly(meth)acrylic acid and a copolymer of (meth)acrylic acid and maleic acid, itaconic acid or lactic acid, Date Recue/Date Received 2022-10-27
13 - 60 ¨ 90 weight-% of polyamino polyether methylene phosphonic acid (PAPEMP), calculated from the total weight of the constituents in the composition as dry, - a corrosion inhibitor selected from the group consisting of diethyl hydroxylamine (DENA), octadecylamine, hexadecylamine, cyclohexylamine, methoxypropylamine, other fatty alcohol amines and any combination of them, and - 1 ¨ 15 weight-% of polycitric acid, calculated as active ingredient from the total weight of the constituents in the composition as dry.
Item 14. The use according to item 13, characterized in that the aqueous system is in a water treatment process and the composition is used as iron dispersant for controlling and preventing the formation of iron deposit and/or dissolving iron deposits in the aqueous system.
Item 15. The use according to item 13, characterized in that the composition is used as iron chelating agent for stabilizing hydrogen peroxide in a pulp bleaching process.
Item 16. The use according to any one of items 13 to 15, characterized in that the composition comprises poly(meth)acrylic acid.
Item 17. The use according to any one of items 13 to 16, characterized in that the polycarboxylic acid has a weight average molecular weight MW less than 5000 g/mol, determined by using gel permeation chromatography (GPC).
Item 18. The use according to any one of items 13 to 16, characterized in that the polycarboxylic acid has a weight average molecular weight MW in the range of 1000 ¨ 5000 gimol, determined by using gel permeation chromatography (GPC).
Item 19. The use according to any one of items 13 to 18, characterized in that Date Recue/Date Received 2022-10-27
Item 14. The use according to item 13, characterized in that the aqueous system is in a water treatment process and the composition is used as iron dispersant for controlling and preventing the formation of iron deposit and/or dissolving iron deposits in the aqueous system.
Item 15. The use according to item 13, characterized in that the composition is used as iron chelating agent for stabilizing hydrogen peroxide in a pulp bleaching process.
Item 16. The use according to any one of items 13 to 15, characterized in that the composition comprises poly(meth)acrylic acid.
Item 17. The use according to any one of items 13 to 16, characterized in that the polycarboxylic acid has a weight average molecular weight MW less than 5000 g/mol, determined by using gel permeation chromatography (GPC).
Item 18. The use according to any one of items 13 to 16, characterized in that the polycarboxylic acid has a weight average molecular weight MW in the range of 1000 ¨ 5000 gimol, determined by using gel permeation chromatography (GPC).
Item 19. The use according to any one of items 13 to 18, characterized in that Date Recue/Date Received 2022-10-27
14 the composition comprises diethyl hydroxylamine (DEHA) as the corrosion inhibitor.
Item 20. The use according to any one of items 13 to 19, characterized in that the amount of the polycarboxylic acid in the composition is in the range of 5 ¨
30 weight-%, calculated from the total weight of the constituents in the composition, as dry.
Item 21. The use according to any one of items 13 to 20, characterized in that the amount of polyamino polyether methylene phosphonic acid (PAPEMP) in the composition is in the range of 70 ¨ 80 weight-%, calculated from the total weight of the constituents in the composition, as dry.
Item 22. The use according to any one of items 13 to 21, characterized in that the amount of the corrosion inhibitor in the composition is in the range of 2 ¨ 10 weight -%, calculated from the total weight of the constituents in the composition, as dry.
Item 23. The use according to any one of items 13 to 22, characterized in that the composition is used in an amount of 5 ¨ 100 ppm.
Item 24. The use according to any one of items 13 to 22, characterized in that the composition is used in an amount of 5 ¨ 70 ppm.
Item 25. The use according to any one of items 13 to 22, characterized in that the composition is used in an amount of 5 ¨ 50 ppm.
Date Recue/Date Received 2022-10-27
Item 20. The use according to any one of items 13 to 19, characterized in that the amount of the polycarboxylic acid in the composition is in the range of 5 ¨
30 weight-%, calculated from the total weight of the constituents in the composition, as dry.
Item 21. The use according to any one of items 13 to 20, characterized in that the amount of polyamino polyether methylene phosphonic acid (PAPEMP) in the composition is in the range of 70 ¨ 80 weight-%, calculated from the total weight of the constituents in the composition, as dry.
Item 22. The use according to any one of items 13 to 21, characterized in that the amount of the corrosion inhibitor in the composition is in the range of 2 ¨ 10 weight -%, calculated from the total weight of the constituents in the composition, as dry.
Item 23. The use according to any one of items 13 to 22, characterized in that the composition is used in an amount of 5 ¨ 100 ppm.
Item 24. The use according to any one of items 13 to 22, characterized in that the composition is used in an amount of 5 ¨ 70 ppm.
Item 25. The use according to any one of items 13 to 22, characterized in that the composition is used in an amount of 5 ¨ 50 ppm.
Date Recue/Date Received 2022-10-27
Claims (25)
1. A method for stabilizing iron compounds in an aqueous environment, characterized in that the method comprises adding to an aqueous system a composition, which comprises - a polycarboxylic acid or its salt(s) selected from the group consisting of poly(meth)acrylic acid and a copolymer of (meth)acrylic acid and maleic acid, itaconic acid or lactic acid, - 60 ¨ 90 weight-% of polyamino polyether methylene phosphonic acid (PAPEMP), calculated from the total weight of the constituents in the composition as dry, - a corrosion inhibitor selected from the group consisting of diethyl hydroxylamine (DENA), octadecylamine, hexadecylamine, cyclohexylamine, methoxypropylamine, other fatty alcohol amines and any combination of them, and - 1 ¨ 15 weight-% of polycitric acid, calculated as active ingredient from the total weight of the constituents in the composition as dry.
2. The method according to claim 1, characterized in that the composition comprises poly(meth)acrylic acid.
3. The method according to claim 1 or 2, characterized in that the polycarboxylic acid has a weight average molecular weight MW less than 5000 g/mol, determined by using gel permeation chromatography (GPC).
4. The method according to claim 1 or 2, characterized in that the polycarboxylic acid has a weight average molecular weight MW in the range of 1000 ¨ 5000 g/mol, determined by using gel permeation chromatography (GPC).
5. The method according to any one of claims 1 to 4, characterized in that the composition comprises diethyl hydroxylamine (DENA) as the corrosion inhibitor.
Date Recue/Date Received 2022-10-27
Date Recue/Date Received 2022-10-27
6. The method according to any one of claims 1 to 5, characterized in that the amount of the polycarboxylic acid in the composition is in the range of 5 ¨ 30 weight-%, calculated from the total weight of the constituents in the composition, as dry.
7. The method according to any one of claims 1 to 6, characterized in that the amount of polyamino polyether methylene phosphonic acid (PAPEMP) in the composition is in the range of 70 ¨ 80 weight-%, calculated from the total weight of the constituents in the composition, as dry.
8. The method according to any one of claims 1 to 7, characterized in that the amount of the corrosion inhibitor in the composition is in the range of 2 ¨ 10 weight -%, calculated from the total weight of the constituents in the composition, as dry.
9. The method according to any one of claims 1 to 8, characterized in that the composition is added to the aqueous system in an amount of 5 ¨ 100 ppm.
10. The method according to any one of claims 1 to 8, characterized in that the composition is added to the aqueous system in an amount of 5 ¨ 70 ppm.
11. The method according to any one of claims 1 to 8, characterized in that the composition is added to the aqueous system in an amount of 5 ¨ 50 ppm.
12. The method according to any one of claims 1 to 11, characterized in that the aqueous system is a water treatment system or a pulp bleaching process.
13. Use of a composition for stabilizing iron compounds in an aqueous system, wherein the composition comprises - a polycarboxylic acid or its salt(s) selected from the group consisting of poly(meth)acrylic acid and a copolymer of (meth)acrylic acid and maleic acid, Date Recue/Date Received 2022-10-27 itaconic acid or lactic acid, - 60 ¨ 90 weight-% of polyamino polyether methylene phosphonic acid (PAPEMP), calculated from the total weight of the constituents in the composition as dry, - a corrosion inhibitor selected from the group consisting of diethyl hydroxylamine (DEHA), octadecylamine, hexadecylamine, cyclohexylamine, methoxypropylamine, other fatty alcohol amines and any combination of them, and - 1 ¨ 15 weight-% of polycitric acid, calculated as active ingredient from the total weight of the constituents in the composition as dry.
14. The use according to claim 13, characterized in that the aqueous system is in a water treatment process and the composition is used as iron dispersant for controlling and preventing the formation of iron deposit and/or dissolving iron deposits in the aqueous system.
15. The use according to claim 13, characterized in that the composition is used as iron chelating agent for stabilizing hydrogen peroxide in a pulp bleaching process.
16. The use according to any one of claim 13 to 15, characterized in that the com position comprises poly(meth)acrylic acid.
17. The use according to any one of claims 13 to 16, characterized in that the polycarboxylic acid has a weight average molecular weight MW less than 5000 g/mol, determined by using gel permeation chromatography (GPC).
18. The use according to any one of claims 13 to 16, characterized in that the polycarboxylic acid has a weight average molecular weight MW in the range of 1000 ¨ 5000 g/mol, determined by using gel permeation chromatography (GPC).
Date Recue/Date Received 2022-10-27
Date Recue/Date Received 2022-10-27
19. The use according to any one of claims 13 to 18, characterized in that the composition comprises diethyl hydroxylamine (DENA) as the corrosion inhibitor.
20. The use according to any one of claims 13 to 19, characterized in that the amount of the polycarboxylic acid in the composition is in the range of 5 ¨ 30 weight-%, calculated from the total weight of the constituents in the composition, as dry.
21. The use according to any one of claims 13 to 20, characterized in that the amount of polyamino polyether methylene phosphonic acid (PAPEMP) in the composition is in the range of 70 ¨ 80 weight-%, calculated from the total weight of the constituents in the composition, as dry.
22. The use according to any one of claims 13 to 21, characterized in that the amount of the corrosion inhibitor in the composition is in the range of 2 ¨ 10 weight -%, calculated from the total weight of the constituents in the composition, as dry.
23. The use according to any one of claims 13 to 22, characterized in that the composition is used in an amount of 5 ¨ 100 ppm.
24. The use according to any one of claims 13 to 22, characterized in that the composition is used in an amount of 5 ¨ 70 ppm.
25. The use according to any one of claims 13 to 22, characterized in that the composition is used in an amount of 5 ¨ 50 ppm.
Date Recue/Date Received 2022-10-27
Date Recue/Date Received 2022-10-27
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2018/077461 WO2019165582A1 (en) | 2018-02-27 | 2018-02-27 | Composition and method for stabilizing iron compounds in an aqueous environment, and use of composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA3088453A1 CA3088453A1 (en) | 2019-09-06 |
| CA3088453C true CA3088453C (en) | 2024-01-02 |
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|---|---|---|---|
| CA3088453A Active CA3088453C (en) | 2018-02-27 | 2018-02-27 | Composition and method for stabilizing iron compounds in an aqueous environment, and use of composition |
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| US (1) | US11498859B2 (en) |
| EP (1) | EP3759050B1 (en) |
| CN (1) | CN111770895A (en) |
| BR (1) | BR112020014560A2 (en) |
| CA (1) | CA3088453C (en) |
| ES (1) | ES2942584T3 (en) |
| FI (1) | FI3759050T3 (en) |
| RU (1) | RU2757475C1 (en) |
| WO (1) | WO2019165582A1 (en) |
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| CN113388456B (en) * | 2021-06-08 | 2023-04-07 | 安徽省复和利泰节能环保科技有限公司 | Medium-high pressure boiler anti-corrosion and scale-inhibiting cleaning agent and preparation method thereof |
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|---|---|---|---|---|
| US4409121A (en) * | 1980-07-21 | 1983-10-11 | Uop Inc. | Corrosion inhibitors |
| US4614646A (en) * | 1984-12-24 | 1986-09-30 | The Dow Chemical Company | Stabilization of peroxide systems in the presence of alkaline earth metal ions |
| US4798675A (en) * | 1987-10-19 | 1989-01-17 | The Mogul Corporation | Corrosion inhibiting compositions containing carboxylated phosphonic acids and sequestrants |
| GB8906413D0 (en) | 1989-03-21 | 1989-05-04 | Ciba Geigy Ag | Composition for treating water or aqueous systems |
| US5358640A (en) * | 1992-07-20 | 1994-10-25 | Nalco Chemical Company | Method for inhibiting scale formation and/or dispersing iron in reverse osmosis systems |
| US5256303A (en) * | 1992-07-20 | 1993-10-26 | Nalco Chemical Company | Method for inhibiting scale formation and/or dispersing iron in reverse osmosis systems |
| US5683588A (en) | 1995-09-21 | 1997-11-04 | Betzdearborn Inc. | Stabilization of catalyzed aqueous sulfite and bisulfite ion solutions |
| US6337047B1 (en) | 1998-10-30 | 2002-01-08 | Ashland Inc. | Process for dispersing iron oxide in steam generating boilers |
| US6835702B2 (en) | 2000-11-07 | 2004-12-28 | Ecolab Inc. | Compositions and methods for mitigating corrosion of applied color designs |
| GB0324238D0 (en) | 2003-10-16 | 2003-11-19 | Rhodia Consumer Specialities L | Formulation for corrosion and scale inhibition |
| RU2255053C1 (en) | 2004-05-05 | 2005-06-27 | Гаврилов Наум Беньяминович | Composition for treatment of cooling water |
| US7402263B2 (en) | 2005-04-25 | 2008-07-22 | Nalco Company | Tungstate based corrosion inhibitors |
| MX2010014519A (en) * | 2008-07-07 | 2011-02-22 | Lubrizol Advanced Mat Inc | Preventing silica and silicate scale with inhibitors in industrial water systems. |
| US8071067B2 (en) | 2009-05-26 | 2011-12-06 | Kemira Water Solutions, Inc. | Processes for making stable ferric chloride solutions |
| CN101700936A (en) | 2009-11-17 | 2010-05-05 | 上海丰信环保科技有限公司 | High-hardness water scale inhibitor |
| CN103420514A (en) | 2012-05-25 | 2013-12-04 | 魏从莲 | Preparation method of multi-amino multi-ether methylene phosphonic acid compound scale inhibitor |
| US10011508B2 (en) | 2013-03-04 | 2018-07-03 | Aulick Chemical Solutions, Inc. | Corrosion control composition for water treatment process |
| US9290849B2 (en) * | 2013-06-26 | 2016-03-22 | Chemtreat, Inc. | Corrosion control methods |
| CN104628157A (en) | 2013-11-15 | 2015-05-20 | 青岛水世界环保科技有限公司 | Environment-friendly antiscale dispersing agent |
| CN104030461B (en) | 2014-04-21 | 2015-09-30 | 上海电力学院 | A kind of Scale inhibitors for restraining calcium sulfate scale formation and preparation method thereof |
| CN107720984A (en) * | 2017-10-17 | 2018-02-23 | 高产明 | A kind of preparation method of the low-phosphorous water quality stabilizer of efficient scale corrosion inhibition type |
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- 2018-02-27 CN CN201880090326.4A patent/CN111770895A/en active Pending
- 2018-02-27 BR BR112020014560-2A patent/BR112020014560A2/en active IP Right Grant
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- 2018-02-27 WO PCT/CN2018/077461 patent/WO2019165582A1/en active Application Filing
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| BR112020014560A2 (en) | 2020-12-08 |
| WO2019165582A1 (en) | 2019-09-06 |
| EP3759050B1 (en) | 2023-02-15 |
| US20200354248A1 (en) | 2020-11-12 |
| EP3759050A4 (en) | 2021-10-06 |
| RU2757475C1 (en) | 2021-10-18 |
| US11498859B2 (en) | 2022-11-15 |
| CA3088453A1 (en) | 2019-09-06 |
| FI3759050T3 (en) | 2023-05-08 |
| ES2942584T3 (en) | 2023-06-02 |
| EP3759050A1 (en) | 2021-01-06 |
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